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Income Taxes - Additional Information (Detail) (USD $)
In Millions, unless otherwise specified
3 Months Ended 9 Months Ended
Sep. 30, 2012
Sep. 30, 2011
Sep. 30, 2012
Sep. 30, 2011
Income Taxes [Line Items]        
Provision for income taxes for continuing operations $ 11.5 $ 22.1 $ 31.6 $ 32.4
Increase in provision for income taxes $ (10.6)   $ (0.8)  
Federal statutory rate 35.00%   35.00%